Lock



FIG. 1 is a front elevational view of a lock showing our new design;

FIG. 2 is rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front perspective view thereof; and,

FIG. 8 is a rear perspective view thereof.

The light lines in the drawing represent the contours and not the surface shading. 

CLAIM The ornamental design for a lock, as shown and described. 